<!DOCTYPE html>
<html>
<head>
    <title>GH-1140 index</title>
    <style>
        #iframe {
            position:absolute;
            top:1200px;
            width:250px;
            height:250px;
        }

        #target {
            width:50px;
            height:50px;
            background: grey;
        }
    </style>
</head>
<body>
<div id="target"></div>
<iframe id="iframe" src="iframe.html"></iframe>
</body>
</html>